APA (7th ed.) Citation

Knapton, E. J. (1963). Empress Josephine. Harvard University Press.

Chicago Style (17th ed.) Citation

Knapton, Ernest John. Empress Josephine. Cambridge, Mass.: Harvard University Press, 1963.

MLA (9th ed.) Citation

Knapton, Ernest John. Empress Josephine. Harvard University Press, 1963.